# sudoku

step 1 2 3 4 5 6 7 8 9 10
<home

A very easy puzzle to get the idea of how sudoku is solved
explanations:-
this is step 8

With 6's in c7 and c8 and row 1 there is only one place for a 6 in box 3 at c9r3 and the new 6 together with 6's in c6 and c2 fix the 6 in box 1 at c3r2.

The 6's in r4 and r6 with the 6 in c2 fix the 6 box 4 at c1r5.

Box 4 now has only two cells free for a 1 or a 2. Because r6 already has a 1 in it, cell c2r6 must be a 2 leaving c2r5 for the 1. (entered in step 9)

.Now we know the 1 in box 4 has to be in c2, the 1's in c3 and r7 position the 1 in box 7 in cell c1r9

This leaves two cells free in box 7 for a 2 and 7. c3 already has a 7 so c3r9 must be a 2 and therefore c1r7 a 7 and then only one space left in row 7 for a 2 (entered in step 9)

 c1 c2 c3 c4 c5 c6 c7 c8 c9 6 4 5 9 6 3 6 r1 box 1 2 & 3 3 -box 1- 6 6 -box 2- 4 9 - box 3  6 5 r2 8 5 9 7 6 4 6 r3 9 8 3 4 2 1 5 7 r4 box 4 5 & 6 6 - box 4  6 4 8 - box 5 - 7 5 - box 6  9 r5 5 6 7 3 9 1 8 4 r6 1 3 8 5 4 9 r7 box 7 8 & 9 4 - box 7  9 5 6 - box 8 box 9 r8 1 1 9 8 4 5 r9
 [ contact me, Roger Walker ] 15th january 2010 © 2014